They don't sound appetizing to me (of course, I don't/can't eat seafood - most of it, just the smell of it cooking, makes me sick to my stomach). I think the person who used "Jelly diel" thought it was some sort of pastry come to think of it.
Had eel for lunch today (in Bruges and in a virulent green sauce), partly prompted by this discussion. I enjoyed it. I also really enjoyed Bruges, which I was visiting for the first time - what a gorgeous town!
Best eel I ever had was in Tokyo, many years ago now, at a dedicated unagi restaurant. Very good indeed. (Also, I fell instantly in love with my server, who looked like a young Susan Sarandon.)
I have not tried eel, as far as I know, but given my general dislike of eating animals aquatic, there is a good chance I would not like it. That said, it would very much depend on how it is done.
I am wondering if jellied eels would be "Unagi Zerī" in Japanese, or perhaps they use "Jam" and it'd be "Unagi Jamu." Just don't get in a jam confusing unagi and usagi. Two very different animals!